问题描述：
the answer is B,tell me why please
This is an illness that can result in totle blindness if( )
A.to leave untreating B.left untreated C.leaving untreating D.is left untreated
This is an illness that can result in totle blindness if( )
A.to leave untreating B.left untreated C.leaving untreating D.is left untreated
问题解答：
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